Reusable and Long-Lasting Active Microcleaners for Heterogeneous Water Remediation

Jemish Parmar, Diana Vilela, Eva Pellicer, Daniel Esqué-de los Ojos, Jordi Sort, Samuel Sánchez

Research output: Contribution to journalArticleResearchpeer-review

42 Citations (Scopus)

Abstract

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Self-powered micromachines are promising tools for future environmental remediation technology. Waste-water treatment and water reuse is an essential part of environmental sustainability. Herein, we present reusable Fe/Pt multi-functional active microcleaners that are capable of degrading organic pollutants (malachite green and 4-nitrophenol) by generated hydroxyl radicals via a Fenton-like reaction. Various different properties of microcleaners, such as the effect of their size, short-term storage, long-term storage, reusability, continuous swimming capability, surface composition, and mechanical properties, are studied. It is found that these microcleaners can continuously swim for more than 24 hours and can be stored more than 5 weeks during multiple cleaning cycles. The produced microcleaners can also be reused, which reduces the cost of the process. During the reuse cycles the outer iron surface of the Fe/Pt microcleaners generates the in-situ, heterogeneous Fenton catalyst and releases a low concentration of iron into the treated water, while the mechanical properties also appear to be improved due to both its surface composition and structural changes. The microcleaners are characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), nanoindentation, and finite-element modeling (FEM).
Original languageEnglish
Pages (from-to)4152-4161
JournalAdvanced Functional Materials
Volume26
DOIs
Publication statusPublished - 20 Jun 2016

Keywords

  • catalysts
  • heterogeneous catalysis
  • microcleaners
  • micromotors
  • nanorobots
  • wastewater treatment

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